Electrical converter



(No Model.)

' G. PPANNKUOHE.

BLEOTRIGALGONVBRTER.

No. 429,583. Patented June 3, 1890.-

K avimwtoz *4 35 1; awe-$14M;

V UNITED STATES PATENT OFFICE.

GUSTAV PFANNKUOHE, OF CLEVELAND, OHIO.

ELECTRICAL CONVERTER.

QPECIFICA'IION forming part of Letters Patent No. 429,583, dated June 3,1890.

Application filed September 28, 1889. Serial No. 325,401. (No model.)

To all whom it may concern:

Be it known that I, GUSTAV PFANNKUCHE, of Cleveland, in the county ofCuyahoga and State of Ohio, have invented certain new and usefulImprovements in Converters; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe saine.

My invention relates to an improvement in converters; and it consists incertain features of construction and combinations of parts, as

.will be hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view, partly in sideelevation, of my improved converter supported on a reel. Fig. 2 is asimilar view, the reel being dispensed with. Fig. 3 is a transverse viewof the ironwire core and the primary and secondary coils.

A represents a reel, which may be made of wood or metal. Each side orhalf of the reel consists of a hub 13, from which radiates'any desirednumber of spokes O, which are each provided with a series of holes.Strips D, of wood, hard rubber, or fiber, are inserted through the holesa in the spokes, and are secured against displacement by means of pinsor keys I), inserted through their outer and projecting ends. Upon thestrips or distancepieces D is wound the iron wire composing section E ofthe core. Strips or distancepiecesD are then inserted and secured withinthe holes a in the spokes and the iron wire forming section F of thecore is wound upon them. In the same manner the core is built up of anydesired number of sections of wire, the outer section being secured bythe strips D.

It will be observed that the core, when formed in the manner shown, isthoroughly ventilated, its outer surfaces being exposed to the air andany desired number of ventilating-spaces D formed between the severalsuperposed coils or sections. The reel forms a convenient holder orframe for supporting the converter or securing it in place.

The iron wire of which the core is made may be naked iron wire suitablyvarnished, or it may consist of cotton-covered wire or naked iron wirehaving its successive layers insulated from each other by strips ofcotton or other material.

Around the core are Wound the primary and secondary coils J and J, whichare insulated from each other and also from the iron core byventilatingspaces formed in the following manner: Upon the corners ofthe iron core are placed the corner-pads I, which are made of vulcanizedfiber, cotton cloth, or any suitable material, and around the pads iswound the coarse copper wire J, which constitutes the secondary coil ofthe converter,while the primary coil maybe composed of any number ofsuperposed layers of wire J. I prefer to dispose the conductors ofthesecondary and primary coils in such manner that the secondary coil shallconsist of a single layer only of coarsewire and thereby insure it thebest possible insulation and ventilation. By separating the secondarycoil from the core by means of the corner-pads I produceventilating-spaces K between the outer surfaces of the core and theinner surfaces of the secondary coil. Upon the corners of the secondarycoil are placed insulating corner-pads I,upon which is wound the finewire constituting the primary coil J, the inner surfaces of which areinsulated from the secondary coil by the intervening ventilating-spacesM.

By winding the core and the secondary and primary coils in the mannerdescribed all parts of the converter are exposed to inspection and areaccessible for repairs. Again, the intervening spaces formed between thesections of the core,between the core and secondary coil, and betweenthe secondary and primary coil, insure visible insulation of the partsand also provide for perfect ventilation and the carrying off of theheat developed in the use of the converter, thereby obviating the dangerof the burning out of the converter.

Instead of winding the core on a reel, as illustrated in Fig. 1, it maybe wound on distance-pieces and the latter connected by steel pins N, asillustrated in Fig. 2.

It is evident that the core may be widely varied in form, that it maybemade square or round or of other shape in cross-section, and that it maybe made of four, six, eight, or any desired number of sides, that thesecondary coil may be coupled up in series or in any other desiredmanner, and, further, that the converter may be varied in its details ofconstruction, all without involving a departure from the spirit or scopeof my invention,and hence I would have it understood. that I do notrestrict myself to the particular form and construction of parts shownand described; but,

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a converter, the eombinatiomwith an annular core, of primary andsecondary coils wound transversely around the core, and corner-padsinserted between the coils and between the coils and core, therebyforming ventilating-spaces between the core and coils and between thecoils, substantially as set forth.

2. In a converter, the combination, with a core, of distance-piecesinserted between the superposed layers or sections of the core, forming'intervening ventilating-s ntces, and rods or spokes for securing theends of the distance-pieces against displacement, substantially as setforth.

3. In a converter, the combination, with a reel provided with detachabledistance-pieces,

of corner-pads on the corners of the core, and

a secondary coil wound upon the corner-pads, substantially as set forth.

5. In a converter, the combination, with a core provided withventilating-spaces extending transversely through it, of a secondarycoil encircling the core, and insulating cornerpads for formingventilating-spaces between the core and secondary coil, substantially asset forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

GUSTAV PFANNKUCIIE.

Witnesses:

JOHN C. DOLPH, W. A. PALLANT.

